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I think the JVC 1702 also was a commercial grade monitor with inputs and outputs and BNC jacks. This JVC actually only has composite input too. The EIA-J8 or whatever that multi pin connector is the VTR version which carries audio and video AFAIK.

Ah yes you can definitely see the family resemblance! JVC sold a version of the 1702 although I think it lacked the Chroma/ Luma inputs. I've only seen photos of it but this one is clearly a higher spec model than that.